[build] Avoid sparse undeclared symbol warning for PROVIDE_SYMBOL()

Signed-off-by: Michael Brown <mcb30@ipxe.org>

diff --git a/src/include/compiler.h b/src/include/compiler.h
index ed9af237d01adac8f351a545d34cee4df9a7c912..e55592456a80265fad6d5cefaa96317d1b5ac587 100644 (file)
--- a/src/include/compiler.h
+++ b/src/include/compiler.h
@@ -64,6 +64,7 @@
        .comm   _sym, 0
 #else /* ASSEMBLY */
 #define PROVIDE_SYMBOL( _sym )                         \
+       extern char _sym[];                             \
        char _sym[0]
 #endif /* ASSEMBLY */